Everything you need to know about charging RV batteries
Since I''ve purchased the rig (new), I''ve noticed when the batteries need charging, and I am plugged in or running the onboard generator, the charging voltage is 13.6/13.7 volts, whether the batteries are at 50% SOC [State of Charge], or 90% SOC. Even if the batteries are fully charged, they will still show a charge rate of 13.6/13.7 volts ...